Our Staff


Our coaches are experienced in working with children, as well as coaching and competing at vaulting at the highest levels.  Our longeurs are lifelong horse people who match the strength of our coaches in depth of experience.


Flávia Themudo Guida
Head Coach

Flávia recently moved to the Bay Area from São Paulo, Brazil.

For 30 years, Flavia has vaulted and coached vaulting, winning 10 National Championships in Brazil herself, and coaching 5 National Champion Teams in both A- and B- levels. She and her teams have competed internationally, garnering many awards. She also volunteered her time teaching over 100 very young, at-risk children the value of exercise and conditioning.

Krista Mack

Competitive Team Coach 

High Performance Individuals Coach


Horse Manager and Trainer

Harry Idehara


Fitness Instructor

Competive Trot Coach


Introductory Trot Coach

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Krista Mack has longued for Woodside Vaulters since 2002, and is currently our head horse trainer.  Krista was born and raised in Woodside and grew up riding in Woodside Pony Club and Woodside Jr Riders.  She has coached trot through Jr Team at Woodside Vaulters, and competed at the 2018 World Equestrian Games in Tryon, North Carolina with Elizabeth Osborn and Atterupgaards Sting.  In 2007 and 2014, Krista won the AVA Trainer of the Year award for her consistent, high-level training of Woodside Vaulters' horses, who have won three AVA Horse of the Year awards and five USEF Vaulting Horse of the Year awards. 

Sarah Twohig
Barn Manager
Horse Rider and Trainer
Sarah Twohig
Barn Manager
Horse Rider and Trainer

Sarah has been riding since she could sit up straight; she rides both English and Western. Sarah has been with Woodside Vaulters for several years, serving as groom at home and on the road, including in Europe at WEG 2015. She now lunges for trot and the Jr. Team. Sarah also rides several of our horses when they are not in class.

At home, Sarah has over 200 animals, including mini-donkeys, horses, and at least one crazy parrot.


Sarah is also Woodside Vaulters Barn Manager


Elsa Haugen

High Performance Canter Coach

TIny Tots Coach

Elsa has been a member of Woodside Vaulters for five years.  She competed as a gold level vaulter this past season, taking 3rd at the National Championships in Missouri.  She competed at CVI Chililwack as an Individual winning 2* and qualifying to compete at 3*.


Clara Oberg

Assistant Coach High Performance Cater

Fitness Coach

Clara has been vaulting for eight years and is currently competing at the silver/2* level. She was a member of the 2019 Woodside Vaulters Junior Team and competed in Saumur both individually and with the team.